[PATCH v3 1/1] fs: move kernel_read_file* to its own include file

From: Scott Branden
Date: Wed Jun 17 2020 - 12:12:37 EST

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Move kernel_read_file* out of linux/fs.h to its own linux/kernel_read_file.h
include file. That header gets pulled in just about everywhere
and doesn't really need functions not related to the general fs interface.

Suggested-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Scott Branden <scott.branden@xxxxxxxxxxxx>

---
Changes since v2:
Added changes information here.
Changes since v1:
Updated commit message to give Christoph's reasoning as to
why the functions should be moved to another header file.
---
drivers/base/firmware_loader/main.c | 1 +
fs/exec.c | 1 +
include/linux/fs.h | 39 ----------------------
include/linux/ima.h | 1 +
include/linux/kernel_read_file.h | 52 +++++++++++++++++++++++++++++
include/linux/security.h | 1 +
kernel/kexec_file.c | 1 +
kernel/module.c | 1 +
security/integrity/digsig.c | 1 +
security/integrity/ima/ima_fs.c | 1 +
security/integrity/ima/ima_main.c | 1 +
security/integrity/ima/ima_policy.c | 1 +
security/loadpin/loadpin.c | 1 +
security/security.c | 1 +
security/selinux/hooks.c | 1 +
15 files changed, 65 insertions(+), 39 deletions(-)
create mode 100644 include/linux/kernel_read_file.h

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index ca871b13524e..136933f1bd6e 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -12,6 +12,7 @@

#include <linux/capability.h>
#include <linux/device.h>
+#include <linux/kernel_read_file.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
diff --git a/fs/exec.c b/fs/exec.c
index 7b7cbb180785..4ea87db5e4d5 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -23,6 +23,7 @@
* formats.
*/

+#include <linux/kernel_read_file.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/fdtable.h>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2e675c075694..09427d393954 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3012,45 +3012,6 @@ static inline void i_readcount_inc(struct inode *inode)
#endif
extern int do_pipe_flags(int *, int);

-#define __kernel_read_file_id(id) \
- id(UNKNOWN, unknown) \
- id(FIRMWARE, firmware) \
- id(FIRMWARE_PREALLOC_BUFFER, firmware) \
- id(FIRMWARE_EFI_EMBEDDED, firmware) \
- id(MODULE, kernel-module) \
- id(KEXEC_IMAGE, kexec-image) \
- id(KEXEC_INITRAMFS, kexec-initramfs) \
- id(POLICY, security-policy) \
- id(X509_CERTIFICATE, x509-certificate) \
- id(MAX_ID, )
-
-#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
-#define __fid_stringify(dummy, str) #str,
-
-enum kernel_read_file_id {
- __kernel_read_file_id(__fid_enumify)
-};
-
-static const char * const kernel_read_file_str[] = {
- __kernel_read_file_id(__fid_stringify)
-};
-
-static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
-{
- if ((unsigned)id >= READING_MAX_ID)
- return kernel_read_file_str[READING_UNKNOWN];
-
- return kernel_read_file_str[id];
-}
-
-extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
- enum kernel_read_file_id);
-extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t,
- enum kernel_read_file_id);
-extern int kernel_read_file_from_path_initns(const char *, void **, loff_t *, loff_t,
- enum kernel_read_file_id);
-extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
- enum kernel_read_file_id);
extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 9164e1534ec9..148636bfcc8f 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -7,6 +7,7 @@
#ifndef _LINUX_IMA_H
#define _LINUX_IMA_H

+#include <linux/kernel_read_file.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/kexec.h>
diff --git a/include/linux/kernel_read_file.h b/include/linux/kernel_read_file.h
new file mode 100644
index 000000000000..53f5ca41519a
--- /dev/null
+++ b/include/linux/kernel_read_file.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KERNEL_READ_FILE_H
+#define _LINUX_KERNEL_READ_FILE_H
+
+#include <linux/file.h>
+#include <linux/types.h>
+
+#define __kernel_read_file_id(id) \
+ id(UNKNOWN, unknown) \
+ id(FIRMWARE, firmware) \
+ id(FIRMWARE_PREALLOC_BUFFER, firmware) \
+ id(FIRMWARE_EFI_EMBEDDED, firmware) \
+ id(MODULE, kernel-module) \
+ id(KEXEC_IMAGE, kexec-image) \
+ id(KEXEC_INITRAMFS, kexec-initramfs) \
+ id(POLICY, security-policy) \
+ id(X509_CERTIFICATE, x509-certificate) \
+ id(MAX_ID, )
+
+#define __fid_enumify(ENUM, dummy) READING_ ## ENUM,
+#define __fid_stringify(dummy, str) #str,
+
+enum kernel_read_file_id {
+ __kernel_read_file_id(__fid_enumify)
+};
+
+static const char * const kernel_read_file_str[] = {
+ __kernel_read_file_id(__fid_stringify)
+};
+
+static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
+{
+ if ((unsigned int)id >= READING_MAX_ID)
+ return kernel_read_file_str[READING_UNKNOWN];
+
+ return kernel_read_file_str[id];
+}
+
+int kernel_read_file(struct file *file,
+ void **buf, loff_t *size, loff_t max_size,
+ enum kernel_read_file_id id);
+int kernel_read_file_from_path(const char *path,
+ void **buf, loff_t *size, loff_t max_size,
+ enum kernel_read_file_id id);
+int kernel_read_file_from_path_initns(const char *path,
+ void **buf, loff_t *size, loff_t max_size,
+ enum kernel_read_file_id id);
+int kernel_read_file_from_fd(int fd,
+ void **buf, loff_t *size, loff_t max_size,
+ enum kernel_read_file_id id);
+
+#endif /* _LINUX_KERNEL_READ_FILE_H */
diff --git a/include/linux/security.h b/include/linux/security.h
index 2797e7f6418e..fc1c6af331bd 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -23,6 +23,7 @@
#ifndef __LINUX_SECURITY_H
#define __LINUX_SECURITY_H

+#include <linux/kernel_read_file.h>
#include <linux/key.h>
#include <linux/capability.h>
#include <linux/fs.h>
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index bb05fd52de85..54efafc31d34 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -24,6 +24,7 @@
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/kernel.h>
+#include <linux/kernel_read_file.h>
#include <linux/syscalls.h>
#include <linux/vmalloc.h>
#include "kexec_internal.h"
diff --git a/kernel/module.c b/kernel/module.c
index e8a198588f26..6ed67699531f 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -18,6 +18,7 @@
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/kernel.h>
+#include <linux/kernel_read_file.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/elf.h>
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index e9cbadade74b..d09602aab7bd 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -10,6 +10,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/cred.h>
+#include <linux/kernel_read_file.h>
#include <linux/key-type.h>
#include <linux/digsig.h>
#include <linux/vmalloc.h>
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index e3fcad871861..57ecbf285fc7 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -13,6 +13,7 @@
*/

#include <linux/fcntl.h>
+#include <linux/kernel_read_file.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/seq_file.h>
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index c1583d98c5e5..15f29fed6d9f 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/file.h>
#include <linux/binfmts.h>
+#include <linux/kernel_read_file.h>
#include <linux/mount.h>
#include <linux/mman.h>
#include <linux/slab.h>
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e493063a3c34..f8390f6081f0 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -9,6 +9,7 @@

#include <linux/init.h>
#include <linux/list.h>
+#include <linux/kernel_read_file.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/magic.h>
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c
index ee5cb944f4ad..81bc95127f92 100644
--- a/security/loadpin/loadpin.c
+++ b/security/loadpin/loadpin.c
@@ -11,6 +11,7 @@

#include <linux/module.h>
#include <linux/fs.h>
+#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
#include <linux/mount.h>
#include <linux/path.h>
diff --git a/security/security.c b/security/security.c
index 2bb912496232..8983cdc07ebb 100644
--- a/security/security.c
+++ b/security/security.c
@@ -16,6 +16,7 @@
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
#include <linux/integrity.h>
#include <linux/ima.h>
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index efa6108b1ce9..5de45010fb1a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -24,6 +24,7 @@
#include <linux/init.h>
#include <linux/kd.h>
#include <linux/kernel.h>
+#include <linux/kernel_read_file.h>
#include <linux/tracehook.h>
#include <linux/errno.h>
#include <linux/sched/signal.h>
--
2.17.1

Next message: Greg Kroah-Hartman: "Linux 5.4.47"
Previous message: Peter Xu: "Re: [PATCH 00/25] mm: Page fault accounting cleanups"
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